Measurement of γ Angle Using B → DK at LHCb

Measurements of the CKM angle via tree-level b ! u and b ! c interference are important for testing the Standard Model through the CKM unitarity constraint. In these proceedings, CP violation measurements with B ! DK decays using 1 fb 1 of data collected in 2011 by LHCb are described, where 2-body ( + , K + K , K + and K + ), 3-body ( K s + and K s K + K ) and 4-body ( K + + and K + + ) D 0 decays are considered. A combined measurement of using the above channels is also presented